Automatic feed for portable drills



A. J. WIKANDER AUTOMATIC FEED F'OR PORTABLE DRILLS March 12, 1929.

iled 001;- 192 2 Sheets-Sheet 2 j HIT" u INVENTOR WITNESSES Z I a Jinx/zeal TWZkana/e;

A ATTORNEY i invention.

fposition of ,partsiwhen the'feeding mecha- Patented Mar. 12, 1929.

I ANDREW J. WIKANDEB, orBnooKLYN, NEW YO K.

remnants Fon ronrA 'Ln infants. 7

Application fi1ed October 3, 1927. Serial 1110. 223,753. g

This invention relates to drills and com-' 'prehends an improved drill to take the place of or to be used in lieu of the ordinary ratchet drill which is actuatedby rocking '5 movement of a'handle. r I i 'One of the principal objects of the present invention is to provide an iinproved'drill which is so constructed and designed as to permit of its operation in inaccessible places and at a point where the ordinary form of ratchet drill could not be used due to the inability to rock or swing the operat- 'ing'h'andle.

The invention furthermore comprehends '15 in a drill ofthe'characterset forth, an 1H1? proved feeding means for automatically ad vancing' the drill toward the work, which means is capable of being rendered active or inactive at the will of the operator.

The; invention furthermore contemplates a drill equipped with afeeding mechanism, which feeding mechanism upon retrograde movement after thedrillingoperation, may be employed as a means "for ejecting the "25 arm bit from the holder.

Other objects reside in the features. of simplicity of construction, economy of production and efiiciency of operation.

, With the. above recitedand other objects '30 in view, reference is had ,to the following' description and 'accompanylng' drawings 1n which there isexhibitedoneexample or emn bodinient "of 'theinvention, while the 1 appended claims. define the actual slope of the r In the drawings-+1 1' V Figural 1s a: vertical sectional view. through a drill constructedqln accordance with the invention and illustrating the same '40 operative use; 1

2is'a plan view thereof; 1'

is- Fig. 31s a fragmentary horizontal sec- 3?) of Fig. 1; t

Fig; 4' is a transverse sectional 'vi'ew taken tional view taken approximately on the line v r w by a nut .32 threaded upon the upper 'or approximately 7 on the line of Fig. '2, and illustrating the position ofparts 'whenj thefeeding mechanism'isactive; v

.' Fig. 5 s a,.s1m1lar-v1ew illustratlng the fnis'm is inactive.

. Referring to the drawings by characters I of reference, lOfdesignates a ihollowfcylin- 'dricali dr'ill'head or body which has secured to its opposite ends, 11 and12 detachably associated therewith and'formed, respecholder 15' provided with a frusto-conical E FT itively, with bearings 13 and 14: which are I disposed in axial alinementw, The bearing-13 --has mounted therein for rotation, a drillfbit bore 16 in which the tapered shank '17 of drill ,bit .18 is adapted to be received;

The upper or innermost end of thebit holder is provided with a beveled pinion 19 which also serves as a shoulder for limiting downward" or axlal movement of the holder. in

the bearing 13, while the lower end ofthe 'h0lder15 is'provided with a reduced exteriorly threaded extension 20 for the recept-1OI1 of a nut 21 which prevents inward or upward axial movement of theholder in the bearing 13'. A central opening 22 in the beveled pinion communicates with the bore 16- to receive the reduced t'ang or terminal 23 of the drill bitfishank 1 7 fora purposeto be hereafter set forth.

The .drill'head or bodylO isflprovided is closed by a cap orclosure plug 25 detachably secured thereto and providedwith an with a radial or lateral tubular boss'24, 'which is preferably inclined'upwardly 'and' which a rotary drive shaft28 extends. 'The j drive shaft-28 at its inner end has secured thereto a beveled'gearl29 which meshes with the beveled pinion 19 so that rotation ofthe drive shaft transmits rotary motion to the drill holder 15 andthedrillwhich is can ried thereby. 7 j Y' In order to provide means for feedingv the drill head and the drill bit carried'thereby toward the work. W, a" feeding" mechanism is employed which includes a jack 'screwBO which threadedly engages a sleeve 31 mounted for rotation inthe bearing 14.

The sleeve is held against axial movement outer end of the sleeve and engaging the upper 'or' outer end 'of 'the bearing. '14, and

the bearing 14. The upperand [outer end of thei jack screw which projects beyond the 1 a sleevef 31 i's'formed with a head '3tjhaving transverse intersecting apertures 35 and: pro- 'videdwithl a pointed terminahor spur 36" whichisdesigned'to,engagewith a stations I ary object S in spaced opposing relation to I the work W.

'40.on the drive shaft 28.

' In order to render the feedingv mechanism automatically operative by the turning of the shaft 28, a tubular stub shaft 37 is mounted within the. head for rotation, the stub shaft having a pinion 38 at its upper end engaging the gear 33 and a worm wheel 39 at its lower end engaging a worm gear In order to mount the stub shaft to permit of shifting move- -ment of the same from an active to an-inact1ve.pos1t1on,or vice versa, to control the feed at the will of the'operaton'a bearing shaft 41 is journaled .in the head on sleeve bearings42 and 43,. with the tubular stub shaft 37 mounted on an eccentric or cam portion 44. of the bearing shaft'4l. The upper end-of the bearing shaft 41 protrudes upweirdly-through the head and has attached thereto acrank 45, then'ianipulating handle 46 ofwhlch 1s hollow to receive a springpressed 'detent 47 whlchis normally engageable selectively in spaced keeper openings 48 and 49 formed in the head 10. The detent is provided with a knob 50 which permits of the retraction-of the same from thekeeper opening with which it is engaged, to allow .for the shifting of the pinion 38 and worm wheel 39-respectively, into. or out ofengagement with the gear 33 and worm gear 40.

In use and operationof the drill, the bit 18 isengaged with the work and the pointed terminal 36. of the. jack screw head. is ad justed to engage'with the stationary object S. o It is, of course, understood that the jack screw is held against rotation by inserting a rod B through one of the transverse intersecting apertures 35 to engage with a station-,

ary abutment A for this purpose. The rotation of the drive shaft'through the beveled inion and ear connection 29 and 19 ro- P r 7 tates thedrill holder 15 and drill 18 to accomplish the. drilling operation. 'lVhen the tubular stubshaft37 is shifted to the position illustrated in Figs. 3 and .4, the worm wheel 39 will be rotatedby the worm gear 40 while. the pinion 5 38 which meshes with the I gear 33 will rotate thesleeve31 to feed or ad- :vance the tool head 10 and the drill toward the v work. I I ing exceeds the speed with which-the drilling It is obvious that in event the feed operation is accomplished, the operator'by pulling upwardly on the knob 50 and swinging-the cam or eccentric portion 44 of'the.

shaft to the position illustrated in Fig. 5, the feeding operation may be discontinued intermittently to coincide. with the speed with which the drillingoperation is being accomplishedfl I When the drilling operation is completed,

3 the drill may be retracted. from, the "work by retrograde turning movement of the shaft 28 and this retrograde movement may be continued untll'the jack screw is advanced a nonrotary threaded member engaging said bore, a stub shaft having eccentric mounting in the drlllhead, ,lnterengaging driving means on the stub shaft and element,

and int'erengaging driving means on the drive shaft and stub shaft, and exteriorly disposed manipulating means for said stub shaft for. moving the same to render the feeding means active'andinactive. 2. A drill, including a drill head, a bit holder rotatably mounted in the drill head,

a rotary drive shaft for rotating "the bit holder, automatic feeding means for advancing the drillholder toward the work, comprising an element'having a threaded bore swiveled for rotation inthe drill head, a nonrotary threaded member engaging said bore, a stub shaft having eccentric mounting in the drill head, interengaging driving means on the stub shaft and element and interengaging driving means on the drive shaft and stub shaft, and means for manually turning the eccentrlcally mounted stub shaft to respectively engage. and disengage'the.

driving connections for rendering the feeding means active and lnactlve atgthe'wlll .of the operator.

a A: drilhincludinga ren w drill head, i a bitholder rotatablymounted in the drill.

head, a rotary drive shaft for rotating the bit holder, and automatic feeding means for V advancing the drilllhead toward the work,

comprising a rotary sleevehaving a threaded bore, a non-rota'ryjack screwengaging,

said bore, a gear on said sleeve,a stub shaft having eccentric mounting inthe drill head, a pinionon said shaft engageable with the sleeve gear, a driving connection between the rotary drive shaft and stub shaft, and means for moving 1 the stub shaft to selectively render the driving connection activelor inactive. v I

4. Adrill, including a hollow-drill head,

a bit holder rotatablymounted the drill; head, a rotary drive shaft for rotating the bitholder, and automatic feeding -.me'ans for said bore, a gear on said sleeve, astub shaft having eccentricv mounting in the drill'head, I a pinion on said shaftengageable -with thev sleeve gear, adriving connection between the rotary drive shaft and stub shaft,andimeans advancing the drill.headtowardjthework, r

compris ngarotary sleeve'havlng'a thread-' ed bore, a non-rotaryi ack screw engaging for moving the stub shaftto selectively ren der the driving connection active or inactive, said means having a detent for holding said latter means in its shifted position.

5. A drill, including a hollow drill head, a bit holder r'otatably mounted in the drill head, provided with a tapered bore anda reduced opening, a drill bit having a tapered shank engageable in the bore and a reduced terminal extending through the reduced opening and protruding beyond the drill holder, a rotary drive shaft hav'ing'opera- Y tive connection with the bit holder for rotating the same, and automatic feeding IIIGZLIISTEOI advancing the drill head and bit to selectively engage the gears to render the feeding means active and inactive.

6. A' drill, including a hollow drill head, a bit holder rotatably mounted in the drill head, provided with a tapered bore and a reduced opening a drill bit havin shank engageable in the bore and a reduced terminal-extending through the reduced opening and protruding beyond the drill holder, a rotary drive shaft havingoperative connection with the bit holder for .roj tating the same, and automatic feeding" means for advancing the drill head and bit toward the work, comprising a rotary sleeve having a threaded bore, a non-rotary jack screw engaging said bore, and a gear on said a sleeve, a stub shaft-having eccentric mounting in the drill head, a pinion onsaid shaft engageable wlth the sleeve gear, a worm wheel on the stub shaft, aworm gear on the drive shaft engaging'said worm wheel, and means for moving the stub shaft to selectively engage the gears to render thevfeeding means active andinactive, the feeding vmeans upon retrograde movement of the drive shaft adapted to effectengagement of I the jack screw with the reduced terminal of the drill bit for loosening and ejectingthe same; I V

Signed at day of October, A. D. 1927. v r V ANDREW J. WIKANDER.

atapered '30 y New York in the county of New York and State ofNew York this 1st 

